A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . , the relative weights of which are to each PRINCIPLES OF COMBUSTION. 143 become condensed into one volume of carbonic acid (as shown inthe last figure); and that, in the second constituent, the two vol-umes (meaning double bulk) of hydrogen, and 07ie volume ofoxygen, become condensed into two volumes of steam, (asshown in the annexed figure.) other as ] to 8. Hence, the equivalent of the atom of water will be, 1hy
A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . , the relative weights of which are to each PRINCIPLES OF COMBUSTION. 143 become condensed into one volume of carbonic acid (as shown inthe last figure); and that, in the second constituent, the two vol-umes (meaning double bulk) of hydrogen, and 07ie volume ofoxygen, become condensed into two volumes of steam, (asshown in the annexed figure.) other as ] to 8. Hence, the equivalent of the atom of water will be, 1hydrogen -\- 8 oxygen = 9. But oxygen and hydrogen exist in the gase-ous state, and the weight of equal volumes of those gases (or, in otherwords, their relative densities, or specific gravities) are to each other as1 to 16; hence, 1 volume of hydrogen is combined with ^ a volume ofoxygen to form 1 volume of the vapor of water, or steam: for the specificgravity of steam, compared with hydrogen, is as 1 to 9. The annexeddiagram, therefore, will represent the combining weights and volumes ofthe elements of water and of its vapor. Hydrogen, 1. Steam, 9. Oxygen, 8. Steam. or thus,. The following is also much to the point: — La composition de Ieauest un des elemens les plus necessaires aux calculs des chemistes, lesdemiers experiences de MM. Berzelius et Dulong out fourni pour sacomposition des nombres qui sont adoptes r)ar tous les chemistes. Elleest formee dapres eux de Oxygene 1 volume, oxygene. Hydrogene . . . 2 volumes, hydrogene. 1 volume eau. Parmi les nombreuses decouvertes que la science doit a M. Gay Lussac,on remarquera toujours la belle observation sur la composition de Ieau,qui le conduisit a trouver les vrais rapports des gaz et des vapeurs dansleurs combinaison. Des experiences tres exactes, quil avoit faites con-jointement avec M. de Humboldt, lui prouverent que Veav formte dhinvolume cfoxygene et de deux volumes de hydrogene, resultat plaiuementcon
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